html, body {
            height: 100%;
        }
.footerbox {
    background-color: #37393a;
    float: left;
    width: 100%;
    position: fixed;
    bottom: 0px;
}
.footer {
    width: 1200px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    margin: 0 auto;
    color: #fff;
    font-size: 14px;
}
        .box {
            
            background-size: cover;

            margin: 0 auto;
            position: relative;
            width: 100%;
            height: 100%;
        }

        .login-box {
            width: 100%;
            max-width: 500px;
            height: 400px;
            position: absolute;
            top: 50%;

            margin-top: -200px;
            /*设置负值，为要定位子盒子的一半高度*/

        }

        @media screen and (min-width: 500px) {
            .login-box {
                left: 50%;
                /*设置负值，为要定位子盒子的一半宽度*/
                margin-left: -250px;
            }
        }

        .form {
            width: 100%;
            max-width: 500px;
            height: 275px;
            margin: 2px auto 0px auto;
        }

        .login-content {
            border-bottom-left-radius: 8px;
            border-bottom-right-radius: 8px;
            height: 250px;
            width: 100%;
            max-width: 500px;
            background-color: rgba(255, 250, 2550, .6);
            float: left;
        }

        .input-group {
            margin: 30px 0px 0px 0px !important;
        }

        .form-control,
        .input-group {
            height: 40px;
        }

        .form-actions {
            margin-top: 30px;
        }

        .form-group {
            margin-bottom: 0px !important;
        }

        .login-title {
            border-top-left-radius: 8px;
            border-top-right-radius: 8px;
            padding: 20px 10px;
            background-color: rgba(0, 0, 0, .6);
        }

        .login-title h1 {
            margin-top: 10px !important;
        }

        .login-title small {
            color: #fff;
        }

        .link p {
            line-height: 20px;
            margin-top: 30px;
        }

        .btn-sm {
            padding: 8px 24px !important;
            font-size: 16px !important;
        }

        .flag {
            position: absolute;
            top: 10px;
            right: 10px;
            color: #fff;
            font-weight: bold;
            font: 14px/normal "microsoft yahei", "Times New Roman", "宋体", Times, serif;
        }